Distribution System Analysis Tools for Studying High Penetration of PV with Grid Support Features. Raja Ayyanar
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1 Distribution System Analysis Tools for Studying High Penetration of PV with Grid Support Features Raja Ayyanar School of Electrical, Computer and Energy Engineering Arizona State University PSERC Webinar 12/10/2013
2 Acknowledgements 2 PSERC Project: Distribution System Analysis Tools for Studying High Penetration of PV with Grid Support ASU Team Features PI: R. Ayyanar, T. Overbye Graduate student (ASU): Adarsh Nagarajan High Penetration of Photovoltaic Generation Study Flagstaff Community Power DOE Grant #: DE-EE Partners: APS (Lead), GE, NREL and ViaSol
3 3 Some of the material is based upon work supported by the Department of Energy under Award Number(s) DE-EE This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. The methods, results and conclusions shown are preliminary and based on an ongoing project, and are subject to change as more data become available.
4 Outline 4 Issues to be studied for high PV penetration Test feeder details Feeder model development and automation Steady-state analysis and results Modeling in quasi-static analysis tools and model validation Modeling in transient analysis tools Network reduction Dynamic phasor approach Automated model development in MATLAB/Simulink Dynamic analysis examples
5 High PV penetration impact 5 Impact analysis Voltage profile Interaction with conventional voltage regulating devices Protection coordination Under reverse power flow Power quality harmonics, voltage flicker, phase unbalance Islanding detection Control with grid interactive inverters Storage, microgrid in supporting high penetration
6 Data for study and operation 6 GIS (geographic information system) AMI (advanced metering infrastructure) Solar data Distribution DAS (data acquisition system) Design details of inverters? Future: real-time inverter/system information (plug & play smart inverters)
7 Tools for static, time-series and dynamic/transient analysis 7
8 Outline 8 Issues to be studied for high PV penetration Test feeder details Feeder model development and automation Steady-state analysis and results Modeling in quasi-static analysis tools and model validation Modeling in transient analysis tools Network reduction Dynamic phasor approach Automated model development in MATLAB/Simulink Dynamic analysis examples
9 High PV penetration feeder in Flagstaff, AZ 9 Feeder length Peak load Capacity Customers Residential Commercial 9 miles ~ 7 MW ~ 13 MW ~ 3000 ~ 300 Primary segments 1809 Transformers 921 Fuses 186 Capacitor banks 3 OCR (recloser) 2 # residential PV > 125 Residential PV 467 kw (kw) Cromer 471 kw Doney park 604 kw Total 1.55 MW
10 High Bandwidth Feeder and PV Data Acquisition 10 6 High bandwidth feeder DAS SEL 735 PQ meters, 1-s data GPS synchronized and event based data capture Parameters monitored (> 70) V, I, kw, kwh, kvar, harmonics 17 Residential PV DAS SEL 734P PQ meters, 1s and 1 min data 6 Weather stations 1 s data, GPS synchronized Irradiance, temperature, rain, relative humidity AMI AMI meters on all customer loads ( ~ 3300) 15 min and hourly data for modeling Feeder DAS locations
11 Outline 11 Issues to be studied for high PV penetration Test feeder details Feeder model development and automation Steady-state analysis and results Modeling in quasi-static analysis tools and model validation Modeling in transient analysis tools Network reduction Dynamic phasor approach Automated model development in MATLAB/Simulink Dynamic analysis examples
12 Static and quasi-static modeling Automation of modeling process is the main focus 12
13 Feeder Network Model Development (Auto conversion of GIS data to CYMDIST model using MATLAB) 13 Start Read Shape Files Topology Identification Island Analysis Associate Conductors with Sections Add Equipment (xfmr, load, fuse, switch, cap) Write to TXT Files End
14 Feeder Model 14 CYMDIST model OpenDSS model
15 Outline 15 Issues to be studied for high PV penetration Test feeder details Feeder model development and automation Steady-state analysis and results Modeling in quasi-static analysis tools and model validation Modeling in transient analysis tools Network reduction Dynamic phasor approach Automated model development in MATLAB/Simulink Dynamic analysis examples
16 kw profile at high penetration 16 kw profile along feeder with PVs kw profile along feeder without PVs 400 kw PV Doney Park Total Loads: 2937 kw Total amount of PV: 1299 kw Penetration: % (May 2012 results) Without PV With PV kw Losses kw kw No-load losses not included
17 Voltage profile at high penetration 17 Voltage profile along feeder with PVs Voltage profile along feeder without PVs Improvements in both voltage magnitude and phase unbalance with high penetration of PV
18 Reactive power support from two large PVs (at highest load) kva PV Doney Park Two capacitor banks turned off automatically Reactive power from the two large inverters (at 90% of the total kva rating) sufficient to maintain voltage without the two capacitor banks
19 Fault Analysis with CYMTCC 19 Protection impact study includes Fuse-fuse coordination for various scenarios Fuse-recloser coordination and nuisance blowing of fuses Relay sensitivity for remote faults CYMTCC (module in CYMDIST) has two protection related analysis Minimum fault analysis to verify if the protection devices can adequately detect and clear the minimum faults in their respective protection zones Fault flow analysis applies a given type of fault at a given location and gives the fault current and voltage profile at any point on the feeder; used here to study impact of PV for various fault conditions
20 Impact of PV Penetration on Fuse Coordination Situation 1: DG located upstream of fault Situation 2: DG located downstream of fault For Fault 1, Fuse 2 is expected to operate faster than Fuse 1 For Fault 2, Fuse 2 should not operate and Fuse 1 is expected to isolate the fault Whether or not Fuse 2 opens for Fault 2 depends on DG fault current contribution 20 AC Fuse 1 Fault 2 Fuse 2 Fault 1 DG Fuse X04 (Fuse 2) Fuse K25 (Fuse 1) Downstream fault Upstream fault Fault current Operating time Fault current Operating time A 6.99 s 1.11 A No operation A No A s operation No violations observed in the studied cases for Situation 1 or 2
21 Stiffness Ratio Stiffness ratio = I I fault DG _ max I I fault DG _ max 21 fault current available at interconnection max. current from the inverter Stiffness ratio is a good measure of the potential for impact Stiffness ratio in the Flagstaff feeder mostly above 50, and hence limited adverse impact due to PV Generators with low stiffness ratios are studied more extensively
22 Impact on Relay Sensitivity 22 With large DG penetration, the fault current seen at substation relay may be reduced, which impacts its sensitivity to detect remote faults Esub Zsubstation Zfeeder1 Zfeeder2 Relay Vpv Transformer Isub Iinv: PV inverter fault current contribution Fault PV I reduction = Iinv Zfeeder 2 Z + Z + Z substation feeder1 feeder2
23 Outline 23 Issues to be studied for high PV penetration Test feeder details Feeder model development and automation Steady-state analysis and results Modeling in quasi-static analysis tools and model validation Modeling in transient analysis tools Network reduction Dynamic phasor approach Automated model development in MATLAB/Simulink Dynamic analysis examples
24 Time-Series Analysis using OpenDSS 24 Snap shot power flow for a few select cases alone are not enough to understand the time varying effects of PV Time series analysis helps to analyze the distribution system over a defined, longer interval a season, week, or day at fine time resolutions Time series analysis performs a sequence of power flow simulations using time-series load and PV data, with the converged state of one run providing the initial state for the next Operation of components with low-frequency dynamics such as switched capacitors can be studied OpenDSS with a COM interface is an effective tool for time-series analysis
25 o o o Zone division for load (kw, kvar) data Feeder divided into 5 zones based on DAS location DAS measurements in each zone used for load kw and kvar allocation with AMI used for scaling Allows use of 1 s data from feeder DAS for time-series analysis Zone 5 Zone 4 25 Zone 3 Zone 2 Zone 1 Zone 5 Zone 1
26 Time-series analysis and validation (kw) Measured and simulated 1-min interval kw plot of each phase at the substation on 9/25/2012 Measured Phase A kw Simulated Phase A kw 26 kw kw Minute Minute Measured Phase B kw Simulated Phase B kw kw kw 1000 kw kw Minute RMS deviation over the entire day: Phase A: 7.08 kw Phase B: 9.49 kw Phase C: kw Minute Measured Phase C kw Simulated Phase C kw Minute Minute
27 Time-series analysis and validation (kw) Measured and simulated 1-min interval voltage at DAS 05 (middle of the feeder) on 9/25/ DAS05 Measured and simulated one-minute-interval kvln plot of each phase in 2012/9/25 Measured Phase A kvln Simulated Phase A kvln kvln Minute Measured Phase B kvln Simulated Phase B kvln kvln Minute Measured Phase C kvln Simulated Phase C kvln kvln RMS error over the day: Phase A: kv Phase B: kv Phase C: kv (<1%) Minute
28 Time series analysis with and without PV Measured and simulated 1-min interval kw plot of phase A at DAS04 over a day compared with simulated results of no PV scenario Measured Phase A kw Simulated Phase A kw with PV systems Simulated Phase A kw without PV systems kw Minute
29 Outline 29 Test feeder details Modeling in quasi-static analysis tools and model validation Modeling in transient analysis tools Network reduction Validation of dynamic phasor solvers in MATLAB/Simulink Automated model development in MATLAB/Simulink
30 Approach for dynamic modeling 30
31 Network reduction approach Minimum Spanning Tree algorithm to reduce the feeder model The algorithm identifies the nearest three-phase section for each load and PV generator. Aggregates all the loads, without PV generators, for each phase and links it to the nearest three-phase section Retains all the loads which have PV generators associated, since the final goal is to study the dynamic impact of PV inverters on the distribution system 31
32 Result of network reduction Full model Reduced model 32
33 Comparison of the detailed and reduced feeder models 33 Detailed Detailed Reduced Reduced
34 Network reduction Tool also allows to selectively retain a section of the feeder in full detail depending on a given study objective (Ex: lateral microgrid) 34
35 Outline 35 Issues to be studied for high PV penetration Test feeder details Feeder model development and automation Steady-state analysis and results Modeling in quasi-static analysis tools and model validation Modeling in transient analysis tools Network reduction Dynamic phasor approach Automated model development in MATLAB/Simulink Dynamic analysis examples
36 Dynamic phasor method Dynamic phasor is a general averaging procedure applicable to a broad class of circuits and systems 36 The dynamic phasor method is based on the fact that the waveform xx( ) can be approximated on the time interval [tt TT, tt] to arbitrary accuracy with a Fourier series representation of the form xx tt TT + ττ = xx kk tt ee jjjjωω ss(tt TT+ττ) kk where the sum is over all integers kk (but typically a very small subset), ωω ss = 2ππ TT, ττ [0, TT], and xx kk(tt) are the complex Fourier coefficients. tt xx kk tt = 1 TT xx(tt TT + ττ)ee jjkkωω ss(tt TT+ττ) dddd tt TT The analysis computes the time-evolution of the Fourier series coefficients as the window of length TT slides over the actual waveform; transients can be interpreted in terms of envelop variation Reference: S. R. Sanders, J. M. Noworolski, X. Z. Liu, and G. C. Verghese, "Generalized averaging method for power conversion circuits," Power Electronics, IEEE Transactions on, vol. 6, pp , 1991.
37 Dynamic phasor method 37 Derivative of the k th dynamic phasor coefficient d x dt k dx = dt k jkω s x k Multiplication in time-domain involves convolution in phasor domain = xy x y k k l l l
38 An example dynamic phasor analysis 38 sudden change in insolation from 100% to 40% at t=0.3s. sudden change in insolation from 40% back to 100% at t=0.7s step change in Vs from 1 p.u. to 0.9 p.u. at t=1s step change in Vs from 0.9 p.u. to 1.1 p.u. at t=1.2s
39 Models of PV generators 39 Simplified average model Model for phasor analysis
40 Dynamic phasor example 40 Time domain model Dynamic phasor model * K FF Response to change in grid current reference GG iiiiii ss = KK(1+ ss ωωzz) (1+ ss ωωpp), ωω = 2ππππ vv AAAA tt = mm sin ωωωω + θθ VV DDDDDDDDDDDD * Superscripts R and I in phasor model refer to real and imaginary components respectively
41 Outline 41 Issues to be studied for high PV penetration Test feeder details Feeder model development and automation Steady-state analysis and results Modeling in quasi-static analysis tools and model validation Modeling in transient analysis tools Network reduction Dynamic phasor approach Automated model development in MATLAB/Simulink Dynamic analysis examples
42 Modeling in SimPowerSystem 42 Automation of schematic development from GIS for transient analysis tool using depth-first search algorithm SimPowerSystems has an in-built dynamic phasor solver (dynamic phasor models for other transient tools also developed) Possible transient studies: impact of cloud and high ramp rates, impact on cap banks, control interaction, islanding Example: transient simulation with many step changes in insolation and load over 70 s requires 15 min of CPU time
43 Automated model construction in Simulink from GIS 43 Depth-first search algorithm has been used for exploring the feeder Layer based approach Layer 1 contains all the three-phase distribution lines Layer 2 contains the subsystems consisting of all the distribution transformers, loads, and single-phase PV generators All relevant control loops in inverter are modeled in detail DC link voltage controller, PLL, island detection Current loop considered ideal due to its high bandwidth
44 A small part of Simpowersystem model 44
45 Outline 45 Issues to be studied for high PV penetration Test feeder details Feeder model development and automation Steady-state analysis and results Modeling in quasi-static analysis tools and model validation Modeling in transient analysis tools Network reduction Dynamic phasor approach Automated model development in MATLAB/Simulink Dynamic analysis examples
46 Example results: Random variation in PV and voltage regulation by DG 46
47 Example results Cap bank operation 47 Change in substation voltage (1 to 0.95 pu) at 30s and (0.95 to 1 pu) at 65s Change in solar insolation at 35s, 45s and 55s
48 Example results: Different controller bandwidths Change in solar insolation from 70% to 90% at 45 s Performance with different DC link voltage controller bandwidths (only maximum power tracking control) 48
49 Summary 49 Steady-state (snap shot) voltage and fault analysis with PV using CYMDIST and OpenDSS Extensive time series analysis using OpenDSS over longer duration and field validation Dynamic phasor approach in Simulink for dynamic analysis including control functions of PV inverters in large distribution systems (typically with reduced network model) Software tools developed for automation that can be adapted for other feeders and other studies
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